Polyvinylidene fluoride microporous film preparation method

A technology of polyvinylidene fluoride and polyvinylidene fluoride resin, which is applied in the field of preparing polyvinylidene fluoride microporous membranes and thermally induced phase separation, which can solve the difficulty of extraction and recovery of ternary diluents and other issues to achieve a good penetration effect
CN101569837AActive Publication Date: 2009-11-04TSINGHUA UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TSINGHUA UNIV
Publication Date
2009-11-04

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Abstract

The invention relates to a polyvinylidene fluoride microporous film preparation method by thermally induced phase separation, particular to a polyvinylidene fluoride microporous film preparation method by mixing the high temperature solvent and nonsolvent of the polyvinylidene fluoride in certain proportion to form a compound thinner. The method includes the following steps: polyvinylidene fluoride with the mass percentage of 20-60% and a corresponding compound thinner with the mass percentage of 80-40% are added into a stirring kettle, high-temperature digestion and standing deaeration are carried out in sequence to obtain homogeneous casting solution; the casting solution is directly coated on a supporting net by direct knifing to be planar or is spun by a spinneret to be hollow fibrillar, then the casting solution is dipped into cooling fluid for split phase solidification; and the thinner contained in solidification products is extracted, thus obtaining the polyvinylidene fluoride microporous film. The polyvinylidene fluoride microporous film prepared by the invention is high in film strength and large in water flux with the sections which have a uniform and run-through spongelike structure.
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Description

technical field

[0001] The invention belongs to the field of polymer material science and technology, and relates to a method for preparing a polyvinylidene fluoride microporous membrane by a thermally induced phase separation (TIPS) method, especially by combining a high-temperature solvent of polyvinylidene fluoride with a non-solvent A method for preparing a polyvinylidene fluoride microporous membrane by mixing in a certain proportion to form a composite diluent. Background technique

[0002] Membrane separation technology is an effective separation technology, which has the characteristics of simple equipment, convenient operation, energy saving and environmental protection. Since the separation membrane needs to withstand the cleaning of strong oxidizing, strong acid and alkali chemicals during the application process, it is necessary for the membrane material to have excellent chemical stability. As a thermoplastic semi-crystalline polymer, vinylidene fluoride (PVDF)...

Claims

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